C310 (monaural), C320 (stereo): UC Standard version built for UC applications and softphones from Avaya®, Cisco®, IBM®, Skype®, and more** C310-M (monaural), C320-M (stereo): Certified for Skype for Business and Optimized for Microsoft® Lync®

*

Download the latest release of Plantronics Hub software to get one-touch call answer/end with these softphones.